php introduction

php

https://www.youtube.com/watch?v=Z3Y8z09dmF4&list=PLC2mgeYbYNm8TRhX27z6JG0DtR8FR_WuO

php

php is php hyper text processor

open source scripting language

php is free to download and use

php file can contain text, html , css, javascript and php code

php code are executed on the server and the result is returned to the browser as plain html

php have extension .php

php can create dynaic page content

php cancreat ,opm ,read write, delete and close file on the server

php.net visit website

php is a web hosting server

<?php

// PHP code goes here

?>

<?php	beginning tag and ending tag
?>
index.html	this page is called as home page for any website
index.php

the three functions are all same , there is no problem at case insensitive

1.   echo "Hello world using echo </br>";  
2.             ECHO "Hello world using ECHO </br>";  
3.             EcHo "Hello world using EcHo </br>";  

variable declaratioon is case sensitive

three variables are different

1.   $color = "black";  
2.             echo "My car is ". $ColoR ."</br>";  
3.             echo "My dog is ". $color ."</br>";  
4.             echo "My Phone is ". $COLOR ."</br>";